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ISL24211 Folha de dados(PDF) 7 Page - Intersil Corporation

Nome de Peças ISL24211
Descrição Electrónicos  Programmable VCOM Calibrator with EEPROM and Output Buffer
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Fabricante Electrônico  INTERSIL [Intersil Corporation]
Página de início  http://www.intersil.com/cda/home
Logo INTERSIL - Intersil Corporation

ISL24211 Folha de dados(HTML) 7 Page - Intersil Corporation

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ISL24211
7
FN7585.0
February 23, 2011
The maximum value of IDVR_OUT can be calculated by
substituting the maximum register value of 255 into Equation 2,
resulting in Equation 3:
Equation 2 can also be used to calculate the unit sink current
step size per Register Code, resulting in Equation 4:
Determination of RSET
The ultimate goal for the ISL24211 is to generate an adjustable
voltage between two endpoints, VCOM_MIN and VCOM_MAX, with
a fixed power supply voltage, AVDD. This is accomplished by
choosing the correct values for RSET, R1 and R2. The exact value
of RSET is not critical. Values from 1k to more than 100k will
work under most conditions. The following expression calculates
the minimum RSET value:
Note that this is the absolute minimum value for RSET. Larger
RSET values reduce quiescent power, since R1 and R2 are
proportional to RSET. The ISL24211 is tested with a 5kΩ RSET.
Determination of R1 and R2
With AVDD, VCOM(MIN) and VCOM(MAX) known and RSET chosen
per the above requirements, R1 and R2 can be determined using
Equations 6 and 7:
Final Transfer Function
The voltage at DVR_OUT can be calculated from Equation 8:
With amplifier A2 in the unity-gain configuration (VCOM_OUT tied
to INN as shown in Figure 5), VDVROUT =VCOM_OUT =VCOM.
Example
As an example, suppose the AVDD supply is 15V, the desired
VCOM_MIN= 6.5V and the desired VCOM_MAX = 8.5V. RSET is
arbitrarily chosen to be 7.5kΩ.
First, verify that our chosen RSET meets the minimum
requirement described in Equation 5:
Using Equations 6 and 7, calculate the values of R1 and R2:
Table 1 shows the resulting VCOM voltage as a function of register
value for these conditions.
Output Voltage Span Calculation
It is also possible to calculate VCOM(MIN) and VCOM(MAX) from the
existing resistor values.
VCOM_MIN occurs when the greatest current, IDVR(MAX), is drawn
from the middle node of the R1/R2 divider. Substituting
RegisterValue = 255 into Equation 8 gives the following:
Similarly, RegisterValue = 0 for VCOM(MAX):
IDVROUT MAX
()
AVDD
20RSET
--------------------
=
(EQ. 3)
ISTEP
AVDD
256
() 20
() RSET
()
----------------------------------------------
=
(EQ. 4)
RSET MIN
()
AVDD
16
--------------
VOUT MIN
()
AVDD
20
--------------
⎝⎠
⎛⎞
------------------------------------------------------
⎝⎠
⎜⎟
⎜⎟
⎜⎟
⎜⎟
⎛⎞
k
Ω
()
=
(EQ. 5)
R1
5120 RSET
VCOM MAX
() VCOM MIN
()
256 VCOM MAX
()
VCOM MIN
()
---------------------------------------------------------------------------------
⎝⎠
⎜⎟
⎛⎞
=
(EQ. 6)
R2
5120 RSET
VCOM MAX
() VCOM MIN
()
255 AVDD
VCOM MIN
() 256 VCOM MAX
()
+
---------------------------------------------------------------------------------------------------------------------
⎝⎠
⎜⎟
⎛⎞
=
(EQ. 7)
VDVROUT
AVDD
R2
R1 R2
+
--------------------
⎝⎠
⎜⎟
⎛⎞
1
RegisterValue 1
+
256
---------------------------------------------------
R1
20RSET
--------------------
⎝⎠
⎜⎟
⎛⎞
⎝⎠
⎜⎟
⎛⎞
=
(EQ. 8)
TABLE 1. EXAMPLE VDVR_OUT vs REGISTER VALUE
REGISTER VALUE
VDVR_OUT (V)
08.49
20
8.34
40
8.18
60
8.02
80
7.87
100
7.71
120
7.55
127
7.50
140
7.40
160
7.24
180
7.09
200
6.93
220
6.77
240
6.62
255
6.50
7.5k
Ω
()
RSET MIN
()
15
16
-------
6.5V
15
20
-------
⎝⎠
⎛⎞
------------------------------
⎝⎠
⎜⎟
⎜⎟
⎜⎟
⎛⎞
0.163k
Ω
==
⎝⎠
⎜⎟
⎜⎟
⎜⎟
⎛⎞
>
(EQ. 9)
R1
5120 7500
8.5 6.5
256 8.5
6.5
--------------------------------------
⎝⎠
⎛⎞
⋅⋅
35.4k
Ω
==
(EQ. 10)
R2
5120 7500
8.5 6.5
255 15
6.5 256 8.5
+
------------------------------------------------------------------
⎝⎠
⎛⎞
⋅⋅
46.4k
Ω
==
(EQ. 11)
VCOM MIN
()
AVDD
R2
R1 R2
+
--------------------
⎝⎠
⎜⎟
⎛⎞
1
R1
20RSET
--------------------
⎝⎠
⎜⎟
⎛⎞
⎝⎠
⎜⎟
⎛⎞
=
(EQ. 12)
VCOM MAX
()
AVDD
R2
R1 R2
+
--------------------
⎝⎠
⎜⎟
⎛⎞
1
1
256
----------
R1
20RSET
--------------------
⎝⎠
⎜⎟
⎛⎞
⎝⎠
⎜⎟
⎛⎞
=
(EQ. 13)


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